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STOCK-BASED COMPENSATION: - Time-vesting restricted stock unit activity (Details) - Restricted stock units - Time Based Vesting - $ / shares
9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Non-vested restricted stock unit activity    
Outstanding at the beginning of the period (in shares) 3,351,638  
Granted (in shares) 1,969,500  
Vested (in shares) (1,011,380)  
Forfeited or cancelled (in shares) (459,731)  
Outstanding at the end of the period (in shares) 3,850,027  
Non-vested restricted stock units, Weighted average fair value per share at grant date    
Outstanding at the beginning of the period (in dollars per share) $ 40.68  
Granted (in dollars per share) 41.36  
Vested (in dollars per share) 41.43  
Forfeited or cancelled (in dollars per share) 41.35  
Outstanding at the end of the period (in dollars per share) $ 40.75  
Weighted average remaining contractual term (in years) 2 years 6 months 25 days 2 years 6 months 3 days